Identify each of the following structures as chiral or achiral. If chiral, indicate the chiral carbon. OH a. CH3-CH-CH3 Br b. C. Br CH3-CH-CH d. OH CH3-CH2-C-CH3 CH3 CI CI CH3-C-CH2-CH-CH3 CH3 e OH OH I
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- CHE 132 Ch. 18 - Carbohydrates 1. Classify the following carbohydrates in terms of the carbonyl type and the number of carbon atoms. a) Ctz-cH-CH-CH-ビーH CH--C2 OH oH OH OH OH ribose dehyinoxyacetone <) H-ċ-CH-CH-CH2 enythrese 2. Identify the chiral centers in the following molecules. HC-CH-CH2 ーC-CH OH OH OH gluperaldehyde dahydroxyacetone C) CH-CH-CH-CH- OH OH OH ーC-H ribose 3. Draw Fischer projections of the following carbohydrates. (do -for moleculed in #2)Optical Isomers Optical isomers have a chiral carbon atom. A chiral (or asymmetric) carbon atom is one that has four different groups attached to it. a H This carbon is chiral because it has four different groups attached to it. H,N CH, OH C - Identify which carbon (number) has the chiral center CI OH CH3 H H. H2N H- C-H H C F HICI HIndicate whether each of the following molecules are chiral or achiral. Circle the chiral carbon(s) if present in the structure. CH 3 H. C=C%3DC%3D0 H3C BICH 2 C CH2CH 3 CH3 H. b. С. a.
- 1. In the structure provided choose the option YES or NO to indicate if the carbon atoms are chiral. H 2. Assign the absolute configuration of the asymmetric/chiral centers in the provided structures a, b and c. a. a. C-H HO-CH3 H b. NH₂ 3. For the following two structures compared in parts A and B, determine whether they are enantiomers OR diastereomers OR the same structure drawn differently (non-bonding electrons not included for clarity). d. Br Br OH door OH Br b. CH3 HC OH H-C O Br $R= C. OH Br Br OH Br 1Which carbon atom (a - e) in the molecule shown below corresponds to a stereocentre (chiral carbon)? H3C H H.C. a О O a e C b c d H3C CH3 CH32. Indicate whether each of the following molecules are chiral or achiral. Circle the chiral carbon(s) if present in each structure. CH3 H–C–CH,CH CH₂CH₂CH₂ a. H CH3 b. C. OH
- H ÇI CH3-C-COOH он CH3-C-CH2Br 1. ČI a b 81. Consider the structures above. Which of these two contains a stereocenter? Draw thestructure on your answer sheet and mark the stereocenter with an asterisk. 82. Which of these two is a chiral molecule? Explain your answer. 83. Which of these two can exist as a pair of enantiomers? 84. Draw the pair of enantiomers using three-dimensional representation.16.SR-10: Identify, interpret, and draw representations of isomers and conformers. This includes chiral and achiral structures. 1. Draw the following compounds in their bond-line structures as indicated by the Newman projection. Use solid wedges or dashed wedges to denote the correct arrangement at any chiral center (chiral carbon). OH b. OH a. H₂ H H₂C H₂C CH₂OHIdentify which of the compound is chiral.a. T-butyl alcoholb. 2,2-dimethylpropanec. 1,2,4,5-tetramethylcyclohexaned. 2-hydroxypropanoic acid
- 5. Assign R and S to each chiral center. Br H. CI NH2 H, OH H... OCH3 CH3 H. NC A A [ [ Choose ] [ Choose ] [ Choose ] C [ [ Choose ] D. Determine whether each structure is chiral. CI a. HC-CH, b. CH3-CH-CH-CH3 ČI Cl CH3 c. CH3-CH2-OH CI d. HC-CH2 CH; Br12. Identify all four stereoisomers of structure 1. LOH NH2